Author Topic: XPS Board Building Advantages vs EPS Foam  (Read 17577 times)

blackeye

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Re: XPS Board Building Advantages vs EPS Foam
« Reply #30 on: December 03, 2023, 11:42:48 AM »
I think XPS delams BECAUSE it's waterproof. <snip> Water vapor in an XPS board has nowhere to go. 


This would have to be water that is sealed in after a repair, or perhaps condensation from ambient moisture in original construction? Beasho's theory is that water intrusion will just find its way out the way it came in.

My very old very amateur very beat up paddle blade with XPS is sound. I used the coarse surface sanding method.

I'm wondering whether the resin/foam interface fails or is the failure foam/foam beneath the resin that causes the delamination experienced with XPS? I am aware of 80's boats that delaminated because the two skin layers ground down the core between them.

Also, there was discussion years ago about XPS and the mold release on its surface.

lazymodo

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Re: XPS Board Building Advantages vs EPS Foam
« Reply #31 on: February 24, 2024, 02:11:05 PM »
My experience with XPS has been that over time it expands and swells.
I used it for box inserts within 1lb and 2 lb eps and in all cases it swelled and raised abouve thoe original shape (EPS remained stable). My guess is that the blowing agent that normally escapes EPS when it heats is trapped within the closed cells and still expnds with heat but cant escape the closed cell structure.
Just my expeirence.

 


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